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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6188642829a2770044de917870b792f0a1fa9bbf1ba35f3e2cf060ae1f157a5e' 
  AND token = '5lq6Rj3/HCjBLbp/jXEnfuoRLb0e9EkMF7tRzXOzdJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}